An exploit is a way to benefit from an error or an unintended interaction between game mechanics. A player makes the game behave differently from its intended design and uses the result to their advantage. The term comes from the English word exploit, which in this context relates to using something for a benefit.
In gaming, an exploit can mean both the method and its use. “They found an exploit” means someone discovered a way to gain an advantage through a flaw in the game. “They are using an exploit” means a player is applying that method. Not every error is useful, however: a malfunction may simply interfere with play without providing any advantage.
An error versus its use
A bug is an error in how a game works. An exploit is a way to turn that error or an unintended feature to your advantage. The terms are related but not interchangeable: discovering a bug does not necessarily mean exploiting it.
Consider a hypothetical example: a collision error lets a character pass through a barrier that should stop movement. Ending up on the other side accidentally means encountering a bug. Deliberately repeating the action to bypass the obstacle and gain an advantage means using an exploit. What matters is the use of the malfunction, not a particular map or sequence of button presses.
An exploit does not necessarily require third-party software. Actions available within the game may be enough. However, the absence of external software does not automatically make a technique permissible: rules may explicitly prohibit deliberately using errors.
The boundary with permitted techniques
An unusual tactic, a difficult movement technique, or an unexpected combination of abilities does not automatically constitute an exploit. Some less obvious techniques fit within the rules and become ordinary parts of play. In disputed cases, official developer guidance matters; in competitions, regulations and referee decisions also apply.
In discussions, the word is often used as an accusation. A strong advantage alone does not prove that an exploit is involved: it matters whether the result depends on an error and whether the action is permitted. Penalties for using prohibited errors depend on the game or competition rules and may include an account ban or disqualification.